diff options
Diffstat (limited to 'meta/classes')
| -rw-r--r-- | meta/classes/bootimg.bbclass | 110 |
1 files changed, 58 insertions, 52 deletions
diff --git a/meta/classes/bootimg.bbclass b/meta/classes/bootimg.bbclass index 90a241d9b3..bd211fbdc3 100644 --- a/meta/classes/bootimg.bbclass +++ b/meta/classes/bootimg.bbclass @@ -111,6 +111,63 @@ build_iso() { ln -s ${IMAGE_NAME}.iso ${DEPLOY_DIR_IMAGE}/${IMAGE_LINK_NAME}.iso } +build_fat_img() { + FATSOURCEDIR=$1 + FATIMG=$2 + + # Calculate the size required for the final image including the + # data and filesystem overhead. + # Sectors: 512 bytes + # Blocks: 1024 bytes + + # Determine the sector count just for the data + SECTORS=$(expr $(du --apparent-size -ks ${FATSOURCEDIR} | cut -f 1) \* 2) + + # Account for the filesystem overhead. This includes directory + # entries in the clusters as well as the FAT itself. + # Assumptions: + # FAT32 (12 or 16 may be selected by mkdosfs, but the extra + # padding will be minimal on those smaller images and not + # worth the logic here to caclulate the smaller FAT sizes) + # < 16 entries per directory + # 8.3 filenames only + + # 32 bytes per dir entry + DIR_BYTES=$(expr $(find ${FATSOURCEDIR} | tail -n +2 | wc -l) \* 32) + # 32 bytes for every end-of-directory dir entry + DIR_BYTES=$(expr $DIR_BYTES + $(expr $(find ${FATSOURCEDIR} -type d | tail -n +2 | wc -l) \* 32)) + # 4 bytes per FAT entry per sector of data + FAT_BYTES=$(expr $SECTORS \* 4) + # 4 bytes per FAT entry per end-of-cluster list + FAT_BYTES=$(expr $FAT_BYTES + $(expr $(find ${FATSOURCEDIR} -type d | tail -n +2 | wc -l) \* 4)) + + # Use a ceiling function to determine FS overhead in sectors + DIR_SECTORS=$(expr $(expr $DIR_BYTES + 511) / 512) + # There are two FATs on the image + FAT_SECTORS=$(expr $(expr $(expr $FAT_BYTES + 511) / 512) \* 2) + SECTORS=$(expr $SECTORS + $(expr $DIR_SECTORS + $FAT_SECTORS)) + + # Determine the final size in blocks accounting for some padding + BLOCKS=$(expr $(expr $SECTORS / 2) + ${BOOTIMG_EXTRA_SPACE}) + + # Ensure total sectors is an integral number of sectors per + # track or mcopy will complain. Sectors are 512 bytes, and we + # generate images with 32 sectors per track. This calculation is + # done in blocks, thus the mod by 16 instead of 32. + BLOCKS=$(expr $BLOCKS + $(expr 16 - $(expr $BLOCKS % 16))) + + # mkdosfs will sometimes use FAT16 when it is not appropriate, + # resulting in a boot failure from SYSLINUX. Use FAT32 for + # images larger than 512MB, otherwise let mkdosfs decide. + if [ $(expr $BLOCKS / 1024) -gt 512 ]; then + FATSIZE="-F 32" + fi + + mkdosfs ${FATSIZE} -n ${BOOTIMG_VOLUME_ID} -S 512 -C ${FATIMG} ${BLOCKS} + # Copy FATSOURCEDIR recursively into the image file directly + mcopy -i ${FATIMG} -s ${FATSOURCEDIR}/* ::/ +} + build_hddimg() { # Create an HDD image if [ "${NOHDD}" != "1" ] ; then @@ -123,58 +180,7 @@ build_hddimg() { grubefi_hddimg_populate fi - # Calculate the size required for the final image including the - # data and filesystem overhead. - # Sectors: 512 bytes - # Blocks: 1024 bytes - - # Determine the sector count just for the data - SECTORS=$(expr $(du --apparent-size -ks ${HDDDIR} | cut -f 1) \* 2) - - # Account for the filesystem overhead. This includes directory - # entries in the clusters as well as the FAT itself. - # Assumptions: - # FAT32 (12 or 16 may be selected by mkdosfs, but the extra - # padding will be minimal on those smaller images and not - # worth the logic here to caclulate the smaller FAT sizes) - # < 16 entries per directory - # 8.3 filenames only - - # 32 bytes per dir entry - DIR_BYTES=$(expr $(find ${HDDDIR} | tail -n +2 | wc -l) \* 32) - # 32 bytes for every end-of-directory dir entry - DIR_BYTES=$(expr $DIR_BYTES + $(expr $(find ${HDDDIR} -type d | tail -n +2 | wc -l) \* 32)) - # 4 bytes per FAT entry per sector of data - FAT_BYTES=$(expr $SECTORS \* 4) - # 4 bytes per FAT entry per end-of-cluster list - FAT_BYTES=$(expr $FAT_BYTES + $(expr $(find ${HDDDIR} -type d | tail -n +2 | wc -l) \* 4)) - - # Use a ceiling function to determine FS overhead in sectors - DIR_SECTORS=$(expr $(expr $DIR_BYTES + 511) / 512) - # There are two FATs on the image - FAT_SECTORS=$(expr $(expr $(expr $FAT_BYTES + 511) / 512) \* 2) - SECTORS=$(expr $SECTORS + $(expr $DIR_SECTORS + $FAT_SECTORS)) - - # Determine the final size in blocks accounting for some padding - BLOCKS=$(expr $(expr $SECTORS / 2) + ${BOOTIMG_EXTRA_SPACE}) - - # Ensure total sectors is an integral number of sectors per - # track or mcopy will complain. Sectors are 512 bytes, and we - # generate images with 32 sectors per track. This calculation is - # done in blocks, thus the mod by 16 instead of 32. - BLOCKS=$(expr $BLOCKS + $(expr 16 - $(expr $BLOCKS % 16))) - - # mkdosfs will sometimes use FAT16 when it is not appropriate, - # resulting in a boot failure from SYSLINUX. Use FAT32 for - # images larger than 512MB, otherwise let mkdosfs decide. - if [ $(expr $BLOCKS / 1024) -gt 512 ]; then - FATSIZE="-F 32" - fi - - IMG=${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.hddimg - mkdosfs ${FATSIZE} -n ${BOOTIMG_VOLUME_ID} -S 512 -C ${IMG} ${BLOCKS} - # Copy HDDDIR recursively into the image file directly - mcopy -i ${IMG} -s ${HDDDIR}/* ::/ + build_fat_img ${HDDDIR} ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.hddimg if [ "${PCBIOS}" = "1" ]; then syslinux_hddimg_install |